From: "H. Peter Anvin" <hpa@zytor.com>
To: miaox@cn.fujitsu.com
Cc: "Ma, Ling" <ling.ma@intel.com>, Ingo Molnar <mingo@redhat.com>,
Andi Kleen <andi@firstfloor.org>,
Thomas Gleixner <tglx@linutronix.de>,
"Zhao, Yakui" <yakui.zhao@intel.com>,
Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH V2 -tip] lib,x86_64: improve the performance of memcpy() for unaligned copy
Date: Wed, 13 Oct 2010 14:31:47 -0700 [thread overview]
Message-ID: <4CB62543.7000605@zytor.com> (raw)
In-Reply-To: <4CAEDE0D.2040009@cn.fujitsu.com>
On 10/08/2010 02:02 AM, Miao Xie wrote:
> On Fri, 8 Oct 2010 15:42:45 +0800, Ma, Ling wrote:
>> Could you please give us full address for each comparison result,we will do some tests on my machine.
>> For unaligned cases older cpus will crossing cache line and slow down caused by load and store, but for nhm, no necessary to care about it.
>> By the way in kernel 64bit mode, our access mode should be around 8byte aligned.
>
> Would you need my benchmark tool? I think it is helpful for your test.
>
If you could post the benchmark tool that would be great.
-hpa
next prev parent reply other threads:[~2010-10-13 21:32 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-08 7:28 [PATCH V2 -tip] lib,x86_64: improve the performance of memcpy() for unaligned copy Miao Xie
2010-10-08 7:42 ` Ma, Ling
2010-10-08 9:02 ` Miao Xie
2010-10-13 21:31 ` H. Peter Anvin [this message]
2010-10-14 1:14 ` Ma, Ling
2010-10-14 19:43 ` Ma, Ling
2010-10-18 6:23 ` Miao Xie
2010-10-18 6:27 ` Ma, Ling
2010-10-18 6:34 ` Miao Xie
2010-10-18 6:43 ` Ma, Ling
2010-10-18 7:42 ` Miao Xie
2010-10-18 8:01 ` Ma, Ling
2010-10-19 2:53 ` Miao Xie
2010-10-19 4:06 ` Ma, Ling
2010-10-18 3:12 ` Miao Xie
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